A brief information about three substances is given :
X : Transparent, smooth to touch and insulator.
Y : Yellow in colour, good conductor of heat and electricity, lustrous.
Z : Man made material, an insulator, used to make switches and handles of cooking utensils.
X, Y and Z could be respectively
A Water, copper, aluminium
B Glass, gold, plastic
C Paper, aluminium, copper
D Silver, gold, copper.